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Check the variable $PATH, check the order of the PATH, if root has more then put them at last, I mean
root's PATH=/bin;/usr/bin;/usr/ucb/bin;/app/oracle/bin.....etc
oracle's PATH=/app/oracle/bin;/usr/bin;/bin;/local/bin
Then =>
root's PATH=/app/oracle/bin;/usr/bin;/bin;/local/bin;/usr/ucb/bin;...etc
I guess the problem is ucb path